Add a new late-init configuration to skip already filled field in spec.initProvider

pkg/config/common_test.go

@@ -138,7 +138,7 @@ func TestDefaultResource(t *testing.T) {
 	// TODO(muvaf): Find a way to compare function pointers.
 	ignoreUnexported := []cmp.Option{
 		cmpopts.IgnoreFields(Sensitive{}, "fieldPaths", "AdditionalConnectionDetailsFn"),
-		cmpopts.IgnoreFields(LateInitializer{}, "ignoredCanonicalFieldPaths"),
+		cmpopts.IgnoreFields(LateInitializer{}, "ignoredCanonicalFieldPaths", "conditionalIgnoredCanonicalFieldPaths"),
 		cmpopts.IgnoreFields(ExternalName{}, "SetIdentifierArgumentFn", "GetExternalNameFn", "GetIDFn"),
 		cmpopts.IgnoreUnexported(Resource{}),
 		cmpopts.IgnoreUnexported(reflect.ValueOf(identityConversion).Elem().Interface()),

pkg/config/resource.go

@@ -220,10 +220,20 @@ type LateInitializer struct {
 	// "block_device_mappings.ebs".
 	IgnoredFields []string
 
+	// ConditionalIgnoredFields are the field paths to be skipped during
+	// late-initialization if they are filled in spec.initProvider.
+	ConditionalIgnoredFields []string
+
 	// ignoredCanonicalFieldPaths are the Canonical field paths to be skipped
 	// during late-initialization. This is filled using the `IgnoredFields`
 	// field which keeps Terraform paths by converting them to Canonical paths.
 	ignoredCanonicalFieldPaths []string
+
+	// conditionalIgnoredCanonicalFieldPaths are the Canonical field paths to be
+	// skipped during late-initialization if they are filled in spec.initProvider.
+	// This is filled using the `ConditionalIgnoredFields` field which keeps
+	// Terraform paths by converting them to Canonical paths.
+	conditionalIgnoredCanonicalFieldPaths []string
 }
 
 // GetIgnoredCanonicalFields returns the ignoredCanonicalFields
@@ -239,6 +249,19 @@ func (l *LateInitializer) AddIgnoredCanonicalFields(cf string) {
 	l.ignoredCanonicalFieldPaths = append(l.ignoredCanonicalFieldPaths, cf)
 }
 
+// GetConditionalIgnoredCanonicalFields returns the conditionalIgnoredCanonicalFieldPaths
+func (l *LateInitializer) GetConditionalIgnoredCanonicalFields() []string {
+	return l.conditionalIgnoredCanonicalFieldPaths
+}
+
+// AddConditionalIgnoredCanonicalFields sets conditional ignored canonical fields
+func (l *LateInitializer) AddConditionalIgnoredCanonicalFields(cf string) {
+	if l.conditionalIgnoredCanonicalFieldPaths == nil {
+		l.conditionalIgnoredCanonicalFieldPaths = make([]string, 0)
+	}
+	l.conditionalIgnoredCanonicalFieldPaths = append(l.conditionalIgnoredCanonicalFieldPaths, cf)
+}
+
 // GetFieldPaths returns the fieldPaths map for Sensitive
 func (s *Sensitive) GetFieldPaths() map[string]string {
 	return s.fieldPaths

pkg/pipeline/templates/terraformed.go.tmpl

@@ -124,6 +124,15 @@ func (tr *{{ .CRD.Kind }}) LateInitialize(attrs []byte) (bool, error) {
     {{ range .LateInitializer.IgnoredFields -}}
         opts = append(opts, resource.WithNameFilter("{{ . }}"))
     {{ end }}
+    {{- if gt (len .LateInitializer.ConditionalIgnoredFields) 0 -}}
+        initParams, err := tr.GetInitParameters()
+        if err != nil {
+            return false, errors.Wrapf(err, "cannot get init parameters for resource '%q'", tr.GetName())
+        }
+        {{ range .LateInitializer.ConditionalIgnoredFields -}}
+            opts = append(opts, resource.WithConditionalFilter("{{ . }}", initParams))
+        {{ end }}
+    {{ end }}
 
     li := resource.NewGenericLateInitializer(opts...)
     return li.LateInitialize(&tr.Spec.ForProvider, params)

pkg/pipeline/terraformed.go

@@ -59,7 +59,8 @@ func (tg *TerraformedGenerator) Generate(cfgs []*terraformedInput, apiVersion st
 			"Fields": cfg.Sensitive.GetFieldPaths(),
 		}
 		vars["LateInitializer"] = map[string]any{
-			"IgnoredFields": cfg.LateInitializer.GetIgnoredCanonicalFields(),
+			"IgnoredFields":            cfg.LateInitializer.GetIgnoredCanonicalFields(),
+			"ConditionalIgnoredFields": cfg.LateInitializer.GetConditionalIgnoredCanonicalFields(),
 		}
 
 		if err := trFile.Write(filePath, vars, os.ModePerm); err != nil {

pkg/resource/lateinit.go

@@ -10,12 +10,14 @@ import (
 	"runtime/debug"
 	"strings"
 
+	"github.com/crossplane/crossplane-runtime/pkg/fieldpath"
 	xpmeta "github.com/crossplane/crossplane-runtime/pkg/meta"
 	xpresource "github.com/crossplane/crossplane-runtime/pkg/resource"
 	"github.com/pkg/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 
 	"github.com/crossplane/upjet/pkg/config"
+	"github.com/crossplane/upjet/pkg/types/name"
 )
 
 const (
@@ -43,8 +45,9 @@ const (
 
 // GenericLateInitializer performs late-initialization of a Terraformed resource.
 type GenericLateInitializer struct {
-	valueFilters []ValueFilter
-	nameFilters  []NameFilter
+	valueFilters       []ValueFilter
+	nameFilters        []NameFilter
+	conditionalFilters []ConditionalFilter
 }
 
 // SetCriticalAnnotations sets the critical annotations of the resource and reports
@@ -175,6 +178,35 @@ func isZeroValueOmitted(tag string) bool {
 	return false
 }
 
+// ConditionalFilter defines a late-initialization filter on CR field canonical names.
+// Fields with matching cnames will not be processed during late-initialization
+// if they are filled in spec.initProvider.
+type ConditionalFilter func(string) bool
+
+// WithConditionalFilter returns a GenericLateInitializer that causes to
+// skip initialization of the field with the specified canonical name
+// if the field is filled in spec.initProvider.
+func WithConditionalFilter(cName string, initProvider map[string]any) GenericLateInitializerOption {
+	return func(l *GenericLateInitializer) {
+		l.conditionalFilters = append(l.conditionalFilters, conditionalFilter(cName, initProvider))
+	}
+}
+
+func conditionalFilter(cName string, initProvider map[string]any) ConditionalFilter {
+	return func(cn string) bool {
+		if cName != cn {
+			return false
+		}
+
+		paved := fieldpath.Pave(initProvider)
+		value, err := paved.GetValue(name.NewFromCamel(cName).Snake)
+		if err != nil || value == nil {
+			return false
+		}
+		return true
+	}
+}
+
 // LateInitialize Copy unset (nil) values from responseObject to crObject
 // Both crObject and responseObject must be pointers to structs.
 // Otherwise, an error will be returned. Returns `true` if at least one field has been stored
@@ -230,6 +262,16 @@ func (li *GenericLateInitializer) handleStruct(parentName string, desiredObject
 			continue
 		}
 
+		for _, f := range li.conditionalFilters {
+			if f(cName) {
+				filtered = true
+				break
+			}
+		}
+		if filtered {
+			continue
+		}
+
 		observedStructField, _ := typeOfObservedObject.FieldByName(desiredStructField.Name)
 		observedFieldValue := valueOfObservedObject.FieldByName(desiredStructField.Name)
 		desiredKeepField := false

pkg/types/field.go

@@ -104,7 +104,7 @@ func getDocString(cfg *config.Resource, f *Field, tfPath []string) string { //no
 }
 
 // NewField returns a constructed Field object.
-func NewField(g *Builder, cfg *config.Resource, r *resource, sch *schema.Schema, snakeFieldName string, tfPath, xpPath, names []string, asBlocksMode bool) (*Field, error) {
+func NewField(g *Builder, cfg *config.Resource, r *resource, sch *schema.Schema, snakeFieldName string, tfPath, xpPath, names []string, asBlocksMode bool) (*Field, error) { //nolint:gocyclo // easy to follow
 	f := &Field{
 		Schema:         sch,
 		Name:           name.NewFromSnake(snakeFieldName),
@@ -162,6 +162,12 @@ func NewField(g *Builder, cfg *config.Resource, r *resource, sch *schema.Schema,
 		}
 	}
 
+	for _, ignoreField := range cfg.LateInitializer.ConditionalIgnoredFields {
+		if ignoreField == traverser.FieldPath(f.TerraformPaths) {
+			cfg.LateInitializer.AddConditionalIgnoredCanonicalFields(traverser.FieldPath(f.CanonicalPaths))
+		}
+	}
+
 	fieldType, initType, err := g.buildSchema(f, cfg, names, traverser.FieldPath(append(tfPath, snakeFieldName)), r)
 	if err != nil {
 		return nil, errors.Wrapf(err, "cannot infer type from schema of field %s", f.Name.Snake)